EcoSmart ECO-21 Installation Instructions Manual page 7

THE WATER HEATER MUST BE INSTALLED BY A LICENSED PLUMBER IN ACCORDANCE WITH ALL
NATIONAL, STATE, LOCAL, AND/OR PROVINCIAL PLUMBING CODES.
GENERAL PLUMBING GUIDELINES:
The Ecosmart electric tankless water heater is supplied with 1/2" compression fittings. Do not
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weld, use paste, or Teflon on fittings. Use of solder on the water inlet or outlet connections
can damage the flow sensor and will void the warranty.
When connecting the inlet water hose to the unit, use one wrench to hold the unit's connection
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and a second wrench to tighten the hose. This will avoid potentially loosening or damaging the
flow sensor. Over-tightening inlet connections can cause serious damage to the water heater
which is not covered under warranty.
Use of water heater flex hoses is recommended for ease of installation. It is recommended that
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copper pipe be used within 3 feet of the inlet and outlet hoses. Other forms of plastic tubing
may also be acceptable as long as it is rated for high temperature applications.
Use of a temperature pressure relief valve (T&P) is not required for most installations because
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this water heater is tankless and does not store water. However, the valve is recommended
when connecting to flex or high temperature CPVC pipes for added safety. If a T&P valve is
used, it should be connected to a drain. Before installing the water heater, ensure that the
valve is operating correctly and that the air has been purged from the valve. Local code may
also require the use of a T&P valve – check your local requirements and follow them
accordingly. All installations in the Commonwealth of Massachusetts and the State of Kentucky
require the use of a pressure relief valve.
The maximum recommended water pressure for this product is 100 PSI. In homes where water
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pressure is higher, it is recommended that a pressure reduction valve be installed on the main
incoming water supply line prior to installing the water heater.
PLUMBING
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